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# Science a- level hwk help!

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1. Hello. I'm struggling with my chemistry homework, so would any science buff be willing to help me? It's about the reaction of magnesium and oxygen to form magnesium oxide. The problem is that I'm not sure what the question is asking me or what I should do.
1) Calculate the mass of the magnesium that you reacted, the magnesium oxide formed and oxygen that reacted.
2) Calculate the amount, in moles, of Mg and O atoms in the magnesium oxide that you prepared.
Crucible before heating: 24.797g
Crucible before heating with magnesium: 25.014g
Crucible after heating: 25.150g
Thank you. Help would be brilliant!
2. Sorry you've not had any responses about this. Are you sure you've posted in the right place? Here's a link to our subject forum which should help get you more responses if you post there.

Just quoting in Danny Dorito so she can move the thread if needed
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(Original post by Danny Dorito)
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3. You just need to work out how much magesium there was and then the gain in mass is the oxygen that was added to it after heating. Then you can convert the values to moles

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